#include <bits/stdc++.h>
using namespace std;
using namespace std::chrono;
using ll=long long;
using pii=pair<int,int>;
using pll=pair<ll,ll>;
using pdd=pair<double,double>;
using pdl=pair<double,ll>;
const ll LINF=0x3fffffffffffffff;
const ll MOD=1000000007;
const ll MODD=0x3b800001;
const int INF=0x3fffffff;
const double DINF=numeric_limits<double>::infinity();
const vector<pii> four={{1,0},{0,1},{-1,0},{0,-1}};
#define _overload4(_1,_2,_3,_4,name,...) name
#define _overload3(_1,_2,_3,name,...) name
#define _rep1(n) _rep2(i,n)
#define _rep2(i,n) _rep3(i,0,n)
#define _rep3(i,a,b) for(ll i=a;i<b;++i)
#define _rep4(i,a,b,c) for(ll i=a;i<b;i+=c)
#define rep(...) _overload4(__VA_ARGS__,_rep4,_rep3,_rep2,_rep1)(__VA_ARGS__)
#define _rrep1(n) _rrep2(i,n)
#define _rrep2(i,n) _rrep3(i,0,n)
#define _rrep3(i,a,b) for(ll i=b-1;i>=a;i--)
#define _rrep4(i,a,b,c) for(ll i=a+(b-a-1)/c*c;i>=a;i-=c)
#define rrep(...) _overload4(__VA_ARGS__,_rrep4,_rrep3,_rrep2,_rrep1)(__VA_ARGS__)
#define each(i,a) for(auto&& i:a)
#define sum(...) accumulate(range(__VA_ARGS__),0LL)
#define _range(i) (i).begin(),(i).end()
#define _range2(i,k) (i).begin(),(i).begin()+k
#define _range3(i,a,b) (i).begin()+a,(i).begin()+b
#define range(...) _overload3(__VA_ARGS__,_range3,_range2,_range)(__VA_ARGS__)
#define Yes(i) out(i?"Yes":"No")
#define YES(i) out(i?"YES":"NO")
//#define START auto start=system_clock::now()
//#define END auto end=system_clock::now();cerr<<duration_cast<milliseconds>(end-start).count()<<" ms\n"
#define elif else if
#define unless(a) if(!(a))
#define INT(...) int __VA_ARGS__;in(__VA_ARGS__)
#define LL(...) ll __VA_ARGS__;in(__VA_ARGS__)
#define STR(...) string __VA_ARGS__;in(__VA_ARGS__)
#define CHR(...) char __VA_ARGS__;in(__VA_ARGS__)
#define DBL(...) double __VA_ARGS__;in(__VA_ARGS__)
#define vec(type,name,...) vector<type> name(__VA_ARGS__)
#define VEC(type,name,size) vector<type> name(size);in(name)
#define vv(type,name,h,...) vector<vector<type>>name(h,vector<type>(__VA_ARGS__))
#define VV(type,name,h,...) vector<vector<type>>name(h,vector<type>(__VA_ARGS__));in(name)
__attribute__((constructor)) void SETTINGS(){cin.tie(0); cout.tie(0); ios::sync_with_stdio(0); cout<<fixed<<setprecision(15);};
template<class T>
inline constexpr T gcd (T a,T b) {if(a==b)return a;else return gcd(b,(a-1)%b+1);}
template<class T>
inline constexpr T lcm (T a,T b) {a*b/gcd(a,b);}
template<class T>
inline constexpr T min(vector<T>& v){return *min_element(range(v));}
inline char min(string& v){return *min_element(range(v));}
template<class T>
inline constexpr T max(vector<T>& v){return *max_element(range(v));}
inline char max(string& v){return *max_element(range(v));}
template<typename T>
inline bool update_min(T& mn,const T& cnt){if(mn>cnt){mn=cnt;return 1;}else return 0;}
template<typename T>
inline bool update_max(T& mx,const T& cnt){if(mx<cnt){mx=cnt;return 1;}else return 0;}
inline void in() {}
template<class T>
istream& operator >> (istream& is, vector<T>& vec);
template<class T,size_t size>
istream& operator >> (istream& is, array<T,size>& vec);
template<class T,class L>
istream& operator >> (istream& is, pair<T,L>& p);
template<class T>
ostream& operator << (ostream& os, vector<T>& vec);
template<class T,class L>
ostream& operator << (ostream& os, pair<T,L>& p);
template<class T>
istream& operator >> (istream& is, vector<T>& vec){for(T& x: vec) is >> x;return is;}
template<class T,class L>
istream& operator >> (istream& is, pair<T,L>& p){is >> p.first;is >> p.second;return is;}
template<class T>
ostream& operator << (ostream& os, vector<T>& vec){os << vec[0];rep(i,1,vec.size()){os << ' ' << vec[i];}return os;}
template<class T>
ostream& operator << (ostream& os, deque<T>& deq){os << deq[0];rep(i,1,deq.size()){os << ' ' << deq[i];}return os;}
template<class T,class L>
ostream& operator << (ostream& os, pair<T,L>& p){os << p.first << " " << p.second;return os;}
ostream &operator<<(ostream &dest, __uint128_t value) {
    ostream::sentry s(dest);
    if (s) {
        char buffer[128];
        char *d = end(buffer);
        do {
            --d;
            *d = "0123456789"[value % 10];
            value /= 10;
        } while (value != 0);
        int len = end(buffer) - d;
        if (dest.rdbuf()->sputn(d, len) != len) {
            dest.setstate(ios_base::badbit);
        }
    }
    return dest;
}
template <class Head, class... Tail>
inline void in(Head&& head,Tail&&... tail){cin>>head;in(move(tail)...);}
template <class T>
inline void out(T t){cout<<t<<'\n';}
inline void out(){cout<<'\n';}
template <class Head, class... Tail>
inline void out(Head head,Tail... tail){cout<<head<<' ';out(move(tail)...);}
template <class T>
inline void err(T t){cerr<<t<<'\n';}
inline void err(){cerr<<'\n';}
template <class Head, class... Tail>
inline void err(Head head,Tail... tail){cerr<<head<<' ';out(move(tail)...);}


__uint128_t bigMul(__uint128_t a,__uint128_t b,__uint128_t m){
    __uint128_t a_low=a&0xffffffffffffffff,a_high=a>>64,b_low=b&0xffffffffffffffff,b_high=b>>64,result;
    result=a_high*b_high%m;
    rep(64)result=result*2%m;
    result=(result+a_low*b_high+b_low*a_high)%m;
    rep(64)result=result*2%m;
    result=(result+a_low*b_low)%m;
    return result;
}

//n**p % m
__uint128_t bigPowMod(__uint128_t n, __uint128_t p, __uint128_t m){
    __uint128_t ans = 1, ln = n;
    if(p <= 0) return 1;
    while(p != 0){
        if((p & 1) == 1) ans = bigMul(ans, ln, m); //ans = (ans*ln) % m;
        //ln = (ln * ln) % m;
        ln = bigMul(ln, ln, m);
        p = p >> 1;
    }
    return ans;
}

bool suspect(int a, int s, __uint128_t d, __uint128_t n) {
    __uint128_t x = bigPowMod(a, d, n);
    if (x == 1) return true;
    for (int r = 0; r < s; ++r) {
        if (x == n - 1) return true;
        //x = x * x % n;
        x = bigMul(x, x, n);
    }
    return false;
}
const vector<int> test={2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97};
bool MillerRabin(__uint128_t n) {
    if (n <= 1 || (n > 2 && n % 2 == 0)) return false;
    __uint128_t d = n - 1;
    int s = 0;
    while (d%2==0){
        s++;
        d /= 2;
    }
    each(i,test)if (!suspect(i, s, d, n)) return false;
    return true;
}
bool is_prime(__uint128_t n){
    if (n < 2) return false;
    if (n < 4) return true;
    if (!(n % 2)) return false;
    if (!(n % 3)) return false;
    __uint128_t sq = sqrt(double(n))+1;
    const vector<__uint128_t>p={5,7,11,13,17,19};
    each(i,p){
        if (sq < i) return true;
        if (!(n % i)) return false;
    }
    if(MillerRabin(n))return true;
    return false;
}
int n,k;
vector<__uint128_t>primes;
set<tuple<int,string,vector<int>,int>>s;
bool permsearch(int n,string num,__uint128_t num_i,vector<int>&card,int last=0){
    if(s.count({n,num,card,last}))return 0;
    s.insert({n,num,card,last});
    if(n==0){
        if(is_prime(num_i)){
            primes.push_back(num_i);
            k--;
            if(!k)return 1;
        }
        if(k<=100)k--;
        return !k;
    }
    bool b=1;
    rep(i,1,100,2)if(i%5&&card[i]){
        b=0;
        break;
    }
    if(b)return 0;
    b=1;
    rep(i,1,10)if(card[i]){
        b=0;
        break;
    }
    if(b){
        int c=int(num_i%11);
        rep(i,10,100)c+=card[i]*i;
        if(c%11==0)return 0;
    }
    rrep(i,10,100){
        if(i%11==0&&card[i/11]){
            if(last==i)continue;
            int card1=card[i/11],card11=card[i],m=n;
            string num2=num;
            auto num_i2=num_i;
            card[i/11]=0;
            card[i]=0;
            m-=card1+card11;
            rep(j,card11){
                num2=num2+to_string(i);
                num_i2=num_i2*100+i;
            }
            rep(j,card1){
                num2=num2+to_string(i/11);
                num_i2=num_i2*10+i/11;
            }
            while(card[i/11]!=card1||card[i]!=card11){
                if(permsearch(m,num2,num_i2,card,i))return 1;
                if(card[i/11]!=card1){
                    card[i/11]++;
                    m++;
                    num2.pop_back();
                    num_i2/=10;
                }
                else{
                    if(card1){
                        card[i]++;
                        card[i/11]--;
                        num2.pop_back();
                        num_i2/=10;
                    }
                    else{
                        card[i]++;
                        m++;
                        num2.pop_back();
                        num2.pop_back();
                        num_i2/=100;
                    }
                }
            }
            card[i/11]=card1;
            card[i]=card11;
        }
        elif(card[i]){
            card[i]--;
            if(permsearch(n-1,num+to_string(i),num_i*100+i,card))return 1;
            card[i]++;
        }
    }
    return 0;
}
signed main(){
    in(n,k);
    if(n==1){
        INT(a);
        if(is_prime(a))out(a);
        return puts("-1")&0;
    }
    int l=k;
    k+=100;
    VEC(int,a,n);
    if(sum(a)%3==0)return puts("-1")&0;
    vector<int>card(100);
    each(i,a)card[i]++;
    permsearch(n,"",0,card);
    sort(range(primes),greater<__uint128_t>());
    rep(min(l,int(primes.size())))out(primes[i]);
    out(-1);
}